Mounting arrangement for metal door frames

ABSTRACT

A SECTIONAL DOOR FRAME OF SHEEL METAL CONSTRUCTION, COMPRISING A HORIZONTAL HEADER AND A PAIR OF VERTICAL JAMBS HINGEDLY CONNECTED TO THE END OF THE HEADER TO FACILITATE INSTALLATION OF THE FRAME, THE FRAME MEMBERS HAVING MITERED ENDS SEATED AGAINST ONE ANOTHER UPON INSTALLATION OF THE FRAME IN A DOOR OPENING. THE MITERED ENDS OF THE JAMBS AT OPPOSITE SIDES INCLUDE TRIANGULAR CORNER CLIPS WHICH INTERFIT THE MITERED ENDS OF THE HEADER TO A LIGN THE JAMBS AND HEADER UPON INSTALLATION. THE SIDES OF THE TRIANGULAR CORNER CLIPS INCLUDE NOTCHES ENGAGED BY THE END PORTIONS OF THE HEADER TO LOCK THE HEADER AND JAMBS IN ASSEMBLY, COMBINED WITH PINS WHICH ARE DRIVEN IN PLACE TO JOIN THE MEMBERS IN A POSITIVE MANNER AT THE CORNERS. IN ADDITION, THE JAMBS EACH INCLUDE A CLAMP LOCATED NEAR ITS UPPER END, THE CLAMPS BEING ENGAGED AGAINST THE OPPOSITE SIDES OF THE DOOR OPENING AND BEING ADJUSTABLE TO LOCATE THE FRAME, WITH THE LOWER END OF THE JAMBS SECURED TO A BASE ANCHORE TO FACILITATE INSTALLATION AND ADJUSTMENT.

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\, 9E) 22 l BY V I ATTdZtKJKf United States Patent 3,552,085 MOUNTINGARRANGEMENT FOR METAL DOOR FRAMES Harold L. Woodrum, West Chester, Ohio,assignor to The Steelcraft Manufacturing Company, Cincinnati, Ohio,

a corporation of Ohio Filed Feb. 20, 1969, Ser. No. 801,033 Int. Cl.E0611 1/04 US. Cl. 52-211 5 Claims ABSTRACT OF THE DISCLOSURE Asectional door frame of sheet metal construction, comprising ahorizontal header and a pair of vertical jambs hingedly connected to theend of the header to facilitate installation of the frame, the framemembers having mitered ends seated against one another upon installationof the frame in a door opening. The mitered ends of the jambs atopposite sides include triangular corner clips which interfit themitered ends of the header to align the jambs and header uponinstallation. The sides of the triangular corner clips include notchesengaged by the end portions of the header to lock the header and jambsin assembly, combined with pins which are driven in place to join themembers in a positive manner at the corners. In addition, the jambs eachinclude a clamp located near its upper end, the clamps being engagedagainst the opposite sides of the door opening and being adjustable tolocate the frame, with the lower end of the jambs secured to a baseanchor to facilitate installation and adjustment.

BACKGROUND OF THE INVENTION The invention relates to sectional doorframes formed of sheet metal, consisting of a pair of vertical jambs anda horizontal header installed in the door opening of a wall.

Generally speaking, the sectional door frame, to which the invention isaddressed, comprises a header which is generally channel-shaped in crosssection arranged to embrace the opposite surfaces of the wall (which maybe of dry wall construction) across the top of the opening, combinedwith a pair of vertical jambs having their upper ends mitered andhingedly connected to the mitered opposite ends of the horizontalheader, the jambs also being generally channel-shaped in cross sectionand-designed to embrace opposite marginal side portions of the wallsurfaces about the door openings. One of the jambs constitutes a hingejamb to which the door is hingedly connected and the opposite jambcomprises a strike jamb against which the swinging edge portion of thedoor engages.

A sectional metal door frame of this general construction is disclosedin US. Pat. 3,222,833 issued on Dec. 14, 1965, to which attention isinvited. The prior patent is assigned to The Steelcraft Mfg. Co. thepresent assignee.

One of the primary objectives of the present invention has been toprovide a sectional door frame generally similar to the frame structuredisclosed in the prior patent, but being of simplified constructionwhile providing the same advantages of rapid, convenient installation inthe field without requiring fitting operations and permitting the frameto be installed with the use of simple tools such as a hammer andscrewdriver.

In order to provide a simple mounting structure, the upper end portionof each vertical jamb is mitered and each is provided with a pair oftriangular corner clips which are welded to the opposed inner surfacesof the jamb, with portions of the corner clips projecting outwardlybeyond the mitered end portions of the jambs. The projecting portions ofthe clips, upon installation of the frame sections, project into theinterior surfaces at the mitered end portion of the header (which is ofidentical channel-shaped cross section) thus aligning the jambs andheader in the vertical plane.

A further objective has been to provide an improved positive connectionat the mitered comer portions of the header and jambs arranged toforcibly draw the surfaces of the mitered joints into positive clampingengagement with one another, whereby the mitered edges provide ahairline joint having a permanent neat and trim ap pearance.

According to this concept, the upper ends of the jambs are each providedwith an upwardly projecting tongue which interfits a slot formed in themating end portion of the header such that upon installation, the tongueenters the slot to-form a pivotal connection between the header andjambs. This permits the jamb to be pivoted from an inwardly inclinedposition to a vertical position along the marginal edge portion of theopening, providing 'a fulcrum to force the mitered ends of the membersinto intimate engagement, with the corner clips in engagement.

In order to provide a permanent connection at the mitered joint, theedge portion of each corner clip is notched for engagement with the endportion of the header when the two members are forced to their finalmating position. To make the connection positive and permanent, theupper edge of each corner clip (which is secured to the jamb) includes ahorizontal tongue having a hole which mat-es with a hole for-med in theupper surface of the header. After the jamb is pivoted forcibly to itsvertical position, respective locking members, such as nails are driventhrough the matching holes, whereby the nails coact with the hingedjoint and notched connection to lock the parts permanently in assemblyat the corners.

A further objective has been to provide a clamp bracket :for each jambwhich is located near the upper portion of the jamb and engageable withthe surface of the door opening, the clamp bracket being non-rotatableand arranged to locate the sectional frame accurately in alignment withthe door opening.

After the sectional frame has been installed, as outlined above, thelower edges of the jambs are connected to base anchors, fixed to thelower portion of the wall opening, and with the locking nails driven inplace through the headers, the clamp brackets are adjusted to adjust andrigidly clamp the assembled frame in its opening. This completes theinstallation procedure.

The various features and advantages of the invention will be more fullyapparent from the following detailed description taken in conjunctionwith the attached drawmgs.

DRAWINGS In the drawings:

FIG. 1 is a diagrammatic view showing the first step of installing adoor frame in the opening of a building wall, the door frame beingequipped with the mitered corner clip and adjustable jamb anchor of thepresent invention.

FIG. 2 is a view generally similar to FIG. 1, showing the right-handjamb pivoted to its vertical position.

FIG. 3 is a view generally similar to FIG. 2, showing the left-hand jambpivotally connected to the end of the horizontal header ready to bepivoted to its vertical position and clamped in place within the dooropening.

FIG. 4 is a view similar to FIG. 3, showing the lefthand jamb in itsvertical position and secured in place within the door opening.

FIG. 5 is an end view taken along the lines 55 of FIG. 2, illustratingthe jamb, the corner clip, and the jamb anchor.

FIG. 6 is an enlarged fragmentary view, partially in section, as takenfrom FIG. 3, showing the header mounted in place within the dooropening, with the lefthand jamb pivotally connected to the end portionof the header.

FIG. 7 is an enlarged fragmentary sectional view similar to FIG. 6,showing the relationship of the parts after the left-hand jamb has beenpivoted to its upright locking position with reference to the header asin FIG. 4.

FIG. 8 is an enlarged fragmentary perspective view showing the upperportion of the left-hand jamb connected to a portion of the headershowing, in broken lines, the position which the parts assume afterassembly, corresponding to FIG. 7.

FIG. 9 is an enlarged fragmentary sectional view, taken along line 99 ofFIG. 8, detailing the locking engagement of the adjoining edges of theheader and jamb with reference to the notched edge portion of the cornerclip.

FIG. 10 is an enlarged fragmentary sectional view taken along line 10-10of FIG. 5 and similar to FIG.

11, detailing the combination of the corner clip and jamb anchor duringassembly.

FIG. 11 is an enlarged fragmentary sectional view similar to FIG. 10,further illustrating the coaction of the corner clip and jamb anchor atfinal assembly.

FIG. 12 is an enlarged fragmentary perspective view, taken along thelines 12l2 of FIG. 11, detailing the jamb anchor by means of which thejamb is clamped in adjusted position within the door opening.

DOOR FRAME STRUCTURE GENERALLY The corner clip indicated generally at 1,(FIGS. 5-8) is intended to facilitate the installation of the sheetmetal door frame in the opening of a wall 2 of stud-type construction(FIGS. 1-4). Walls of this construction are in common use and are knownin the industry as dry walls in which the Wall comprises verticalstudding, either wood or metal, with panels formed of plaster boardsecured to opposite sides of the studs. The wall 2, shown in FIGS. l-4,represents an internal partition wall of this type; however, thesectional door frame of the invention is also intended to be installedin the external wall of a building such as masonry construction (notshown). The sectional frame structure is also intended for use as awindow frame, utilizing the same general principles of construction andinstallation.

As shown in FIGS. 14, the partition wall comprises a floor runner strip3 formed (in the present example) of sheet metal and permanentlyattached to the floor 4 by nails or screws. A similar runner strip (notshown) preferably is attached to the ceiling of the building to anchorthe upper portion of the wall.

The vertical studs 5, which may be formed of sheet metal, have theirupper and lower ends attached to the runner strips (FIGS. 1-4).Generally speaking the door opening is delineated by the vertical studs55 and a horizontal cross piece 6, which may be fabricated from sheetmetal or wood, depending upon the design of the building. As shown inFIGS. 5 and 12, the dry wall 2, selected to illustrate the principles ofthe invention, consists of the panels 7-7 which are secured to the studs5 and cross piece 6 in a conventional manner.

The door frame, indicated generally at 8, (FIGS. 1-4) in which isembodied the corner clip and adjustable jamb anchor of this invention,comprises the header 10 and the vertical jambs 11 and 12, oneconstituting the hinge jamb and the other forming a latch jamb.

As shown in FIGS. 1-4 and several other views, the mating ends of theheader 10 and the jambs 11 and 12 are mitered as at 13 in the usual wayto interfit one another upon assembly of the framing members within thedoop opening.

The mitered ends of the jambs and header are held in squared matingrelationship with one another by the corner clip 1 of the invention,coacting with respective adjustable jamb anchors, indicated generally at14 (FIGS. 5 and 12). The jamb anchors are located near the upper ends ofthe jambs and are arranged to seat against the vertical studs 5 or anyother wall surface which delineates the door opening, serving to forcethe upper mitered end portions of the jambs toward the pposite miteredends of the header 10. The anchors 14 also permit the assembled doorframe 8 to be adjusted to a plumb position with reference to the dooropening of the wall, as explained later.

It will be understood, at this point, that the jamb anchors 14 coactwith the corner clip structure 1 of the invention in installing the doorframe 8. It should also be noted that the lower ends of the jambs areanchored with reference to the floor 4 by means of base anchors,indicated generally at 15, which are connected in a fixed position withreference to the floor, being secured to the vertical studs or to therunner strip 3.

In installing the door frame 8 of the invention, the header is firstinstalled across the top of the door opening and is preferably held inplace by frictional engagement with the opposite marginal surfaces ofthe wall panels 7. After the header 10 is installed, one of the jambs,for example the right-hand jamb 11 (FIG. 1), is pivotally connected tothe right-hand end of the header by means of a hinge arrangement, asexplained in detail later. After having been pivotally connected, thejamb 11 is pivoted toward its vertical position, as indicated by thearrow, (FIG. 1) frictionally embracing the opposite surfaces of the wallpanels 7 marginally about the door opening. Thereafter, the left-handjamb 12 (FIG. 3) is pivotally connected to the left-hand end of theheader 10 in the same manner and swung, as indicated, to the verticalposition, also embracing the opposite marginal surfaces of the opposedpanels 7 about the door opening.

It will be understood, at this point, that the header 10 and the jambsl1 and 12 (FIG. 5) are identical in cross section, each framing memberbeing generally channel-shaped in cross section to embrace the oppositesides of the wall 2. As shown, the header 10 and the jambs 11 and 12 arein the form of sheet metal stampings of the double rabbet type, eachframing member including a door stop 16 delineating the rabbets 1818(FIG. 12).

The rabbets 1818 each include a yieldable limb 20 completing thechannel-shaped configuration, and each limb includes an in-turned flange21 which includes a reverse or inwardly turned lip 22 which seatsagainst the surface of the wall panels 7, as explained later.

CORNER CLIP As best shown in FIGS. 5 through 9, the corner clips,previously indicated at 1, are arranged in pairs and are spot welded asat 23 to the yieldable limbs 2020 of the jambs 11 and 12. Referring toFIG. 8, the corner clips are located at the upper mitered end portions13 of the jamb, with a portion 24 projecting upwardly above the miterededge 13 for engagement with the mitered end portions of the header atopposite sides, the arrangement being identical for each jamb. It willbe understood at this point. that the arrangement could be reversed,that is, the pairs of corner clips 1 could be spot welded or otherwiseattached to the mitered end portions of the header for engagement withthe mitered end portions of the jambs.

Described in detail, each corner clip 1 is in the form of a triangleproviding a base 25 and a pair of sides 26 rising from the base 25 andleading to a vertex or apex portion 29. In the present example, thetriangular corner clip 1 comprises an isosceles triangle, the length ofthe sides 26 being equal and thus are symmetrical in shape. This makesthe clips interchangeable, permitting identical clips to be secured tothe opposite limbs 20 of the jambs 11 and 12. The corner clips are inthe form of sheet metal stampings and the symmetrical design permitsfabrication in one die set to reduce costs.

The two side portions 26 of the corner clip (FIG. 8) are bent angularlywith reference to the flat plane of the clip proper to form angulated orbevelled lips, indicated at 27. The angulated lips create cammingsurfaces which guide the header and jambs to a flush relationship in thevertical plane as the jambs are pivoted to their vertical position withreference to the opposite ends of the header.

As the header is swung to its vertical position (FIGS. 1, 3, 6 and 10),the angulated or bevelled lip portions 27 of the corner clips atopposite sides progressively engage the mitered edge :13- of the limbsat their interior surfaces. The bevelled lips thus guide the projectingportion 24 of the corner clip into engagement with the interior surfacesof the limbs 20 to bring the jambs precisely in flush and squaredrelationship with the header.

In order to facilitate locating the clip 1 with reference to thernitered end of the header, each side 26 of the clip is provided withtwo right-angular notches indicated at 28 and 30 (FIGS. 5-9). The firstnotch 28 is used in locating corner clip 1 accurately with reference tothe rnitered edge 13 of the jamb. For this purpose, at assembly of jamb,the base 2'5 of the triangular clip may be seated against the in-turnedflange 21 of the limb 20, then the clip is slipped downwardly until thenotch 28 is seated against the upper edge 31 (FIGS. -8 and 9) of therabbet 18 at the base of the mitered edge 13. Thereafter the clip issecured permanently in position by spot welding as at 23. This procedureis carried out identically with respect to both limbs 20-20 of thejambs.

The base portion 25 of each triangular corner clip 1 includes, atopposite end portions, a respective tab 32' projecting at right anglesfrom the base 25 of the clip so as to reside in squared relationship tothe vertical edge of the jamb. Each tab 32 includes a locking aperture33 which coacts with a matching aperture 34 (FIG. 8) formed in theflange 21 of the header.

In order to forcibly clamp the mating rnitered ends 13 of the header andjambs into engagement with one another at installation, a pivotalconnection, as noted earlier, is provided between the ends of the headerand jambs. The pivotal connection is formed by means of a hinge tongue35 projecting upwardly from the upper edge of the door stop section 16of each jamb 11 and 12. The tongue 35 intenfits a slot 36 (FIGS. 6-8)formed near the end portion of the stop section 1'6 of the header at itsopposite ends.

During the assembly operation, with the header 10 in position, one ofthe jambs 11 or "12 is placed in a canted or angular position with itstongue 35 inserted through the slot 36 (FIGS. 1, 6 and 7). It will benoted that the upper portion of each jamb (FIG. 8) includes a cut-outarea 37 delineated by the door stop section 16. The cutout area 37permits the stop section 16 of the header to interfit the upper end ofthe jamb at opposite sides of the door frame. The tongue 35 is formedalong the upper edge 38 of the cut-out area. Accordingly, at assembly,the cut-out area 37 interfits stop 16 of the header, with the tongue 35interfitting the slot 36 of the header.

After the frame elements at one side are thus interconnected (FIGS. 1and 3), the jambs 11 and 12 are pivoted from the canted position towardthe vertical position as indicated by the arrows 39 (FIGS. 1, 3, 6 and10). It will be noted that the interconnecting tongue 35 and slot 36 actas a fulcrum, such that the jambs 11 and 12 provide a lever action toforce the rnitered ends 13 of the header and jamb into pressureengagement, while the corner clips assure the alignment of the headerand jambs in a common plane.

As each jamb is thus pivoted to its vertical position, the lockingapertures 33 of the tabs 32 are shifted into registry with the lockingapertures 34 formed in the header. At or about the same time, the ends40 of the header (rabbets 18-18) are engaged within the locking notches30 of the corner clips 1 at opposite sides to establish a lock at thejuncture of the header and jamb (FIGS. 7 and 9). With the ends of theheader thus engaged within the locking notches 30, a pin or nail, suchas a brad 41, is driven through the matching apertures 33 and 34 of theheader and corner clip, thus securing the two framing members in apositive manner to one another. The pins 41 thus coact with the hingeconnection (tongue and slot 35 and 36) and with the locking notch 30 toprovide a positive and permanent corner connection between the headerand jamb at opposite sides of the door frame.

In an alternate form of construction, a sheet metal screw (not shown) issubstituted for the brad or pin 41 to draw the framing members togetherat the corners.

ADJUSTABLE JAMB ANCHOR After the jambs 11 and 12 have been pivoted totheir upright position and secured to the header in positive squaredrelationship by the corner clips, as described above, the frame assemblyis plumbed with reference to the door opening by the adjustable jambanchor, previously indicated at 14 (FIGS. 5 and 12). In installing theframe, the lower ends of the jambs 11 and 12 preferably are secured tothe base anchors, previously indicated at 15. The base anchor may besimilar to the struc ture disclosed in US. Pat. 3,222,833, previouslyreferred to and is not disclosed in detail in the present application.

Generally speaking, the base anchors 15 are U-shaped and are attached tothe lower end portions of the jambs 11 and 12 to secure the lower endsof the jambs to the studs 5 which delineate the wall opening. TheU-shaped base anchor 15 provides spaced limbs adapted to embrace theopposite sides of the stud 5, an opening 42 (FIGS. 1, 2 and 3) beingformed in the panel 7 in the area to be embraced by the base anchors 15.

Each base anchor 15 is secured to the lower end portion of the jamb bymeans of a mounting plate (not shown) or by other means. After the jambshave been swung to their vertical positions, the U-shaped base anchorsembrace the lower ends of the studs 5 at opposite sides and are thensecured to the studs 5, preferably by sheet metal screws. The anchor andthe stud are provided with pre-formed apertures to receive the screws.After this procedure, the opening 42, formed in the lower portion of thepanels 7, may be plastered over (FIG. 4) to conceal the base anchors andscrews.

The adjustable jamb anchors, previously indicated at 14 (FIGS. 10-12)are located near the upper ends of the jambs, being spaced downwardlyfrom the header as shown. The jamb anchors are arranged to engage thesurface wall opening (studs 5) and to develop a clamping action to forcethe upper portion of the jambs 11 and 12 away from the studs and towardthe rnitered ends of the header. The purpose of the jamb anchors 14 isto adjust the previously squared door frame to a plumb or verticalposition within the door opening. This adjustment is made in a simplemanner with a screwdriver, utilizing a level to bring the jambs to theirperpendicular positions. The present adjustable jamb anchor is generallysimilar to the structure disclosed in the prior US Pat. 3,222,833, andrepresents an improvement over the prior structures in that the anchorclip, as explained below, is held against rotary motion to facilitatethe adjustment procedure.

As best shown in FIGS. 5 and 12, each adjustable jamb anchor 14comprises a sheet metal clamping clip 43 which is U-shaped in crosssection, comprising a cross web 44 having side flanges 45-45 whichloosely interfit the limbs 20-20 of the jamb. The sheet metal clip 43,at its central portion, is bent to provide a U-shaped extension 46projecting from web -44 toward the stop section 16 of the jamb (FIG.12).

As explained below, the jamb anchor 15 is adjusted with reference to thejamb by means of a captive screw 7 47 having a head exposed forscrewdriver engagement at the surface of the stop section 16. In orderto hold the clamping clip 43 against rotary motion in response torotation of the screw 47 during adjustment, there is provided a U-shapedrestraining bracket 48 having opposed limbs 50-50 which slidably embracethe opposite sides of the extension 46.

The restraining bracket 48 comprises a sheet metal stamping, having across web 51 joining the limbs 50 50, The cross Web 51 includes mountingfeet 5252 extending at right angles to the limbs 50 in oppositedirections and spot welded as at 53 to the surface of stop 16 (FIGS. 5,10, 11 and 12). It will be noted, in these views, that the cross web 51of bracket 48 is offset from the feet 52 to provide a space 54 (FIGS. 10and ll) between the surface of stop 16 and cross web 51. The arrangementis such that the captive screw 47 is rotatably confined in the space 54but is held against longitudinal motion.

For this purpose, the captive screw 47 includes, at its outer endportion, a collar 55 which is confined in the space 54. The screwincludes a slotted head 56 which projects outwardly through an openingformed in the metal section 16 so as to be exposed for screwdriverengagement, the outer surface of the screw head 56 being flush with thesurface of the metal section 16. The threaded shank portion of thecaptive screw 47 passes in threaded engagement through the cross web ofthe U-shaped extension 46 (FIG. 5) so as to shift the jamb anchor 14into pressure engagement with the wall surface when the screw 47 isrotated.

Having described my invention, I claim: 1. A sectional metal framearranged to be mounted in the opening of a wall comprising:

a header arranged to be mounted in a horizontal position across the topof the opening; a pair of jambs arranged to be mounted in a verticalposition along opposite sides of said opening; the siad header and jambshaving a web and a pair of limbs arranged to embrace the opposed sidesof the wall marginally about the opening; the adjoining ends of saidheader and jambs interfitting one another upon installation in theopening; coacting hinge means on the interfitting end portions of theheader and jambs to provide a pivotal connection between the header andjambs; respective pairs of corner clips mounted on the interior surfacesof the limbs of the jambs at the interfitting end portions thereof;

each corner clip formed of sheet metal and being tri- 7 angular in shapehaving a base, sides and an apex;

the base of said triangular clip being parallel with the edge of thejamb;

each corner clip having a locating notch formed in one of the sides ofthe triangle below the apex thereof;

said locating notch being interfitted with the upper edge of the web ofthe jamb to locate the clip relative to the end of the jamb when theclip is mounted therein;

said apex portion projecting outwardly beyond the edge of the jamb abovethe Web of the jamb;

said apex portion arranged to guide the jambs and header into flushrelationship as the jambs are pivoted to their vertical positions;

said projecting apex portion of the corner clip having a locking notchformed in the edge portion of the corner clip immediately above saidlocating notch for engagement with the upper edge of the web of theheader as the iambs are pivoted to their vertical positions to lock theadjoining edges of the webs of the header and jambs in engagementrelative to one another as the jambs are swung to their verticalpositions;

each of said corner clips having a locking aperture formed therein;

said header having locking apertures which register with the lockingapertures of the corner clips when the jambs are pivoted to theirvertical positions, whereby upon insertion of a locking element into theregistered apertures, the jambs and header are locked positively insquared relationship.

2. A sectional metal frame as set forth in claim 1 in which the web ofeach jamb includes a hollow door stop portion and in which the upperportion of each jamb, below the interfitted upper end thereof, includesan adjustable jamb anchor, said jamb anchor mounted between the limbs ofthe jambs, the central portion of said jamb anchor having an extensionprojecting outwardly into the hollow door stop portion of the jamb,thereby locking the jamb anchor against rotary motion while providinglineal motion thereof relative to the jamb, a captive screw confinedwithin the web of the jamb and having a shank portion in threadedengagement with the outwardly projccting extension of the adjustablejamb anchor, said screw having a head portion exposed at the surface ofthe web for tool engagement, whereby, upon rotation of the captivescrew, the jamb anchor is forced into clamping engagement with thesurface of the opening to force the upper end of the jambs toward oneanother to bring the ends of the jambs into forcible mating engagementwith the opposite interfitting ends of the header.

3. A sectional metal frame as set forth in claim 1 in which the web ofeach jamb includes a hollow door stop portion and in which the upperportion of each jamb, below the interfitted upper end thereof, includesan adjustable jamb anchor, said jamb anchor mounted between the limbs ofthe jambs, said jamb anchor being generally U-shaped and having anextension projecting outwardly, a restraining bracket having a pair ofspaced limbs secured in the hollow door stop portion of the web of thejamb and embracing the outward extension of the U- shaped jamb anchorand thereby locking the jamb anchor against rotary motion whileproviding lineal motion thereof relative to the jamb, the limbs of saidrestraining bracket having a length greater than the depth of the hollowdoor stop, thereby increasing the lineal adjustment movement of the jambanchor while locking the same against rotary motion, a captive screwconfined within the web of the jamb and having a shank portion inthreaded engagement with the extension of the adjustable jamb anchor,said screw having a head portion exposed at the surface of the web fortool engagement, whereby, upon rotation of the captive screw, the jambanchor is forced into clamping engagement with the surface of theopening to force the upper end of the jambs toward one another to bringthe ends of the jambs into forcible mating engagement with the oppositeinterfitting ends of the header.

4. A sectional metal frame arranged to be mounted in the opening of awall comprising:

a header arranged to be mounted in a horizontal position across the topof the opening;

a pair of jambs arranged to be mounted in a vertical position alongopposite sides of said opening;

the said header and jambs having a web and a pair of limbs arranged toembrace the opposite sides of the wall marginally about the opening;

the limbs of the header and jambs having inturned flanges; the adjoiningends of said header and jambs interfitting one another upon installationin the opening;

coacting hinge means on the interfitting end portions of the header andjambs to provide a pivotal connection between the header and jambs;

respective pairs of corner clips mounted on the interior surfaces of thelimbs of the jambs at the interfitting end portions thereof;

each of said corner clips formed of sheet metal and being triangular inshape having a base sides and an apex;

the base of each triangular clip being seated against the inturnedflange of the jamb;

each clip having a locating notch formed in one edge portion of at leastone of the sides of the triangular clip below the apex thereof;

said locating notch being seated and interfitted with the upper edge ofthe web of the jamb whereby the triangular clip is located relative tothe end of the jamb by engagement of the base with the inturned flange,combined with the engagement of the locating notch with the edge of theweb of the jamb;

said apex portion projecting outwardly beyond the edge of the jamb abovethe web of the jamb;

said apex portion arranged to guide the jambs and header into flushrelationship as the jambs are pivoted to their vertical positions;

said projecting apex portion of each of said corner clips having alocking notch formed in the edge portion of the clip immediately abovesaid locating notch for engagement with the edge of the web of theheader as the jamb is swung to its vertical position;

each of said corner clips having a locking aperture formed therein;

said header having locking apertures which register with the lockingapertures of the corner clips when the jambs are pivoted to theirvertical positions, whereby upon insertion of a locking element into theregistered apertures, the jambs and header are locked positively insquared relationship.

5. A sectional metal frame arranged to be mounted in the door opening ofa wall comprising:

a header arranged to be mounted in a horizontal position across the topof the opening; a pair of jambs arranged to be mounted in a verticalposition along the opposite sides of said opening; the said header andjambs having a web and a pair of limbs projecting generally at rightangles to the web;

the limbs of the header and jambs each including inturned flanges;

the adjoining ends of the limbs and header and jambs being mitered tointerfit one another;

the inturned flanges of the header and jambs arranged to embrace theopposite sides of the wall marginally about the opening with the miteredends of the header and jambs interfitting one another upon installationin the opening;

coacting hinge means on the mitered, interfitting ends of the header andjambs providing a pivotal connection between the header and jambs;

respective pairs of corner clips mounted on the interior surfaces of thelimbs of the jambs at the mitered interfitting end portions thereof;

each of said corner clips being formed of sheet metal and beingtriangular in shape, having a base, sides and an apex, with the base ofthe triangular clip seated against the inturned flange of the jamb;

each of said triangular clips having a locating notch formed in one edgeportion of at least one of the sides of the triangular clip below theapex thereof;

said locating notch being seated and interfitted with the upper edge ofthe web of the jamb at said mitered portion, whereby the triangular clipis located relative to the mitered end of the jamb by engagement of thebase with the inturned flange of the jamb combined with the engagementof the locating notch with the edge of the web of the jamb;

a locking notch formed in the edge portion of the corner clipimmediately above said locating notch for engagement with the edge ofthe web of the header as the jamb is swung to its vertical positionrelative to the header;

said apex arranged to guide the jambs and header into flush relationshipas the jambs are pivoted to their vertical position;

each of said corner clips having a locking aperture formed therein;

said header having locking apertures which register with the lockingapertures of the corner clips when the jambs are pivoted to theirvertical position, whereby, upon insertion of a locking element into theregistered apertures, the jambs and header are locked positively insquared relationship.

References Cited UNITED STATES PATENTS FRANK L. ABBOTT, Primary ExaminerS. D. BURKE, III Assistant Examiner U.S. Cl. X.R.

